Attention: If plan a update to VMware vSphere/vCenter 5.1.0 Update 1. Currently this version contains a bug which prevents User from Login. VMware is working on an Fix. See KB2050941

=> Bug is solved in 5.1.0 Update 1a

Hi everybody,

since VMware vCenter 5.1 a new service SSO, the Single Sign On Service, handles the authentication for all logons. The advantage is that multiple authentication sources are possible. For example Local User and groups, OpenLDAP Directory Services and of course Microsofts Active Directory.

This post is related to vCenter Version 5.1.0b and describes how to add an Active Directory Domain as Identity source and get this running by using the “Reuse session” Authentication Type. The last one is the tricky part :-).

Let us start. Start the vSphere WebClient with a login which owns the appropriate rights, for example admin@system-domain or any other user who owsn has the SSO administrator privileges, and navigate to Administration/Sign On and Discovery/Configration. In the default configuration two identity sources are added by default. The SSO database and the user management of the local server.

To add an Active Directory as identity source the following informations are required

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